The excitation system, which does not
compromise on safety and availability
Electrical Solutions
Instrumentation, Controls & Electrical
SPPA-E3000 Load Dependent
Excitation Systems
Compound Excitation Systems (CES);
type THYRIPART®
are load dependent static and brushless
excitation systems for synchronous generators
and emergency diesel generators. They are
suitable for lower and upper performance
classes up to around 50 MVA in hydroelectric,
gas, steam and nuclear plants (emergency
diesel) and are characterized by maximum
safety and absolute availability.
Your Benefits
■ Uncompromisingly high
safety and absolute
reliability of the excitation
system due to the unique
safety concept
■ Simple exchange of the
old excitation system in
a minimum of time and
without interface problems
■ Low maintenance costs
through the use of proven
industry components
and modular structure
The Task
Sooner or later, the existing excitation system
will reach the end of its service life. This may
be because some modules have been discontinued, or simply because they can no longer
operate economically. This is the case if,
for example, spare parts costs have become
prohibitive, or grid operators impose new
requirements for control dynamics which
the systems are unable to meet, or for some
other reason the statistical risk of failures
exceeds an acceptable level. What is then
required is a solution that perfectly fits the
existing situation in the plant and ensures
reliable, continuous operation based on
innovative technology.
of how the available footprint is, which
generator is used and what kind of control
system is available.
CES has been designed to meet the highest
demands without compromises such as for
safety and for reliability. This concept is unique
in the market: It is essentially based on the use
of the Harz Circuit with a resonant circuit and
reduces the number of components to a minimum. The basic excitation is ensured by the
use of merely passive components – even
following a failure of the governor. This also
complies with the demands of emergency
diesel generators in nuclear plants.
CES uses only proven, tried-and-tested industry
standard components and can be integrated
into the existing plant without any problems –
regardless of whether the controller is implemented in digital or in analog versions.
Of course Siemens ensures smooth replacement, encompassing everything from project
planning through to commissioning, and then
provides ongoing service support for CES.
The Compound Excitation System CES can be adapted
to conditions in each individual power plant. Below is an
example of CES for a synchronous generator in a power plant.
Our Solution
CES is a tried-and-tested solution for synchronous generators of any manufacturer and can
be used both as static excitation system
for generators and as excitation of rotary
excitation machines. Now, the solution has
been running in more than 750 systems,
demonstrating the highest levels of reliability
and robustness.
The solution can be adapted to the conditions
in each individual power plant regardless
siemens.com/sppa
Published by and copyright © 2014:
Siemens AG
Power and Gas Division
Freyeslebenstrasse 1
91058 Erlangen, Germany
For more information contact
sppa-e3000.energy@siemens.com
www.siemens.com/energy/sppa-e3000
Siemens Energy, Inc.
Instrumentation, Controls, & Electrical
1345 Ridgeland Parkway, Suite 116
Alpharetta, GA 30004, USA
E3071_FS11_CES_e_V2-1
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Trademarks mentioned in this document are
the property of Siemens AG, its affiliates, or
their respective owners.
Subject to change without prior notice.
The information in this document contains
general descriptions of the technical options
available, which may not apply in all cases.
The required technical options should
therefore be specified in the contract.